Which Statement About Refraction or Diffraction Is Not Correct

Which statement about refraction or diffraction is not correct?

A) A beam of light is bent or refracted as it moves from air into a denser medium such as water or a glass prism.
B) When a beam of light passes through a narrow slit, it is bent or diffracted by the edges and spreads out in a circular pattern.
C) When a beam of light is diffracted by two slits that are close to each other, the two sets of resulting waves interfere with each other, producing a pattern of light and dark bands.
D) When the crests of two waves overlap, they interfere constructively and produce a light band in the interference pattern.
E) When the crest of one wave overlaps with the trough of another, they are said to be "in phase."